Cinderella's Sister(신데렐라 언니)

Eun Jo has grown up with no illusions about fairytales or happy endings. After her father died when she was young, her mother's choices have kept them living the low life. Her life seems about to change when the daughter of a rich man decides that she wants Eun Jo's mother to marry her rich father. Eun Jo seems to finally have a chance at a stable home and a normal life, but her naive and spoiled new sister Hyo Seon is the center of all the attention. The only person who accepts Eun Jo for who she is is Ki Hoon, an employee at her step-father's company. The two forge a deep bond, but Hyo Seon, who adores Ki Hoon, is furious. Ki Hoon and Eun Jo are soon separated, and when they meet again in adulthood, tragedy and misunderstanding will continue to divide them in this contemporary fairy tale with a love triangle at its center.